H&R Sport Lowering Springs – BMW M4 Competition xDrive Convertible (G83, S58)

OVERVIEW

H&R Sport Springs are the best-selling performance street spring for BMW, and replacing the factory coils is usually the first step in tuning a street car's suspension. Lowering the body reduces the center of gravity and cuts body roll, which improves handling and chassis balance while closing up the fender gap for an aggressive but still driveway-friendly stance. This is H&R's Sport Spring application engineered specifically for the AWD G83 M4 Competition xDrive convertible.

Spring rates are progressive and run 10–20% higher than stock, so the car keeps its ride quality in normal driving and firms up for proper chassis composure when the road turns. Every H&R spring is crafted from 54SiCr6 spring steel and shot-peened, which H&R states increases spring life by more than 200% and keeps the springs from settling or sagging. All production is completed in-house at H&R's ISO 9001-certified facility in Germany, and each spring is 100% tested before it leaves the plant. Quality assurance is backed by TÜV and ISO 9001 certification.

SPECS

• H&R's Sport line for this application lowers the car a similar amount to other G8x Sport kits — approximately 1.0"–1.3" front and 0.4"–1.2" rear; exact figures for this specific convertible application are not published on H&R's US consumer site, so confirm with Speed Logic if exact ride height matters for your build
• Progressive spring rate, increased 10–20% over stock
• Material: 54SiCr6 spring steel, shot-peened; H&R states spring life is increased by more than 200%
• Will not settle or sag
• Manufactured in-house in Germany; every spring 100% tested before shipping
• TÜV and ISO 9001 certified quality assurance
• Requires the factory Adaptive Suspension
• Engineered specifically for the G83 convertible body, AWD (xDrive) — the G83 is offered only with xDrive, no RWD variant exists

PARTS INCLUDED

• Complete spring kit as supplied by H&R Springs; see the installation instructions for the full bill of materials.

TECH RESOURCES

Additional Parts Required

• None. H&R specifies no additional hardware for this spring kit.
• Four-wheel alignment after installation — H&R states that whenever vehicle ride height is adjusted, the wheel alignment must be checked.
• Professional installation — H&R states its springs and suspensions should be installed by professional suspension mechanics only.
• Spring compressor (installer-supplied) to safely disassemble the factory strut assemblies.
• Bumpstop trimming may be required — check your kit number against the bumpstop table in the H&R technical information sheet below before installation.

Installation

• H&R Springs Technical Information & Installation Guide (PDF) — spring identification, ride-height measurement, bumpstop trimming table and alignment requirements.
• Follow the factory service manual procedure for spring replacement and for the post-installation alignment, as directed by H&R.

Notes

• If you have the G82 coupe instead of the G83 convertible, see Speed Logic's separate G82 xDrive listing (28616-4).

PART NUMBER

• 28616-5 — H&R Sport Spring set, BMW M4 Competition xDrive Convertible (G83)

VEHICLE APPLICATIONS